Single-ended PWM controllers for power conversion applications

The ISL7884x family is electrically screened to DSCC SMD# 5962-07249 and is suitable for satellites, down-hole drilling and other high-reliability power supply applications. The ISL7884xASRH series includes four new high-performance, radiation-hardened controllers that are pin-for-pin compatible with industry standard current mode PWM controllers. All meet 100krad(Si) total dose specifications and have been tested for single-event effects with outstanding single event latch-up (SEL), burn out (SEB) and transient (SET) performance up to LET = 86.4 MeV/mg/cm². The series offers Class V and Class Q manufacturing flows for packaged versions, and a Class V flow for die. The new controllers feature a 1A mosfet gate driver, fast transient response with peak current mode control, and current sense propagation delay of 35ns. All versions of this series operate from a 9 to 13.2V input voltage, and over the MIL temperature range of -55^• C to 125C ambient. Start-up current is typically 220microamperes over the full military temperature range and with 100Krad(si) total dose radiation. All of the devices feature adjustable switching frequency up to 1MHz and high peak current drive capability with 50ns rise and fall times into a 1nF capacitance. Two of the ICs, the ISL78843 and the ISL78845, feature a rising under voltage lockout (UVLO) of 8.4V. The ISL78840 and ISL78841 provide rising UVLO of 7V.